Method and apparatus for estimating the frequency and/or phase of a digital signal

US6947508B2 · kind B2 · utility

Assignee

• Rohde & Schwarz GmbH & Co. KG · DE

Inventors

• Markus Freidhof · Kirchseeon, DE
• Kurt Schmidt · Grafing, DE

Key dates

• Filing date: Aug 14, 2001
• Grant date: Sep 20, 2005
• Expiry date: Oct 7, 2023

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03H17/0671
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

An apparatus and method for estimating a frequency and/or a phase of a digital input signal by determining phase values of the input signal. The phase values are then added over a predetermined summation length N/B. The sampling rate of the added-up phase values are reduced by a factor N/B in comparison with the sampling rate of the phase values. The added-up phase values are delayed in a chain of at least B−1 delay elements. The differently-delayed added-up phase values are then added or subtracted to create a resulting. pulse response of the frequency such that the resulting pulse response of the frequency is constant positive in a first interval, is zero in a second interval and is constant negative in a third interval, so that a resulting pulse response of the phase is constant in at least a middle interval or is otherwise zero.